CEPHALOPODS OF THE PHILIPPINE ISLANDS H 



Where the data warranted, I have given the basic indices of all 

 specimens in good condition. Definitions of these indices are given 

 below, together with a description of the method in which the meas- 

 urement was made. Raw data are not given but are on file at the 

 Marine Museum, The Marine Laboratory, University of Miami. 



1. Body Propoktions: 



ML, mantle length: dorsal length of mantle in mm. In decapods, 

 measured from the anteriormost point of the mantle to the apex of 

 the mantle or to the tip of the united fin, whichever is longest. 

 In octopods, measured from the apex to midpoint between eyes. 



VML, ventral mantle length in mm. In decapods and octopods meas- 

 ured from the anteroventral border of the mantle in the midline, 

 to the apex of the mantle or the tip of the united fins, whichever 

 is longest. 



MWI, mantle width index: greatest width of mantle as a percentage 

 of mantle length. 



HWI, head width index: greatest width of head across eyes as a per- 

 centage of mantle length. 



FWI, fin width index: greatest width across both fins as a percentage 

 of mantle length. 



FWIs, fin width index single: greatest width across single fin from center 

 line of mantle as a percentage of mantle length. 



FLI, fin length index: greatest length of fins as a percentage of mantle 

 length. 



Gills, number of primary lamellae on either side of the main axis of the 

 gill, not including the terminal lamellae. Used primarily for the 

 octopods. 



LO, light organs. 



TbI, tubercular ridge index: length of tubercular ridge as a percentage 

 of mantle length. 



E, diameter of eye measured across bulbus. 



NCI, nuchal commissure index: width of nuchal commissure as a per- 

 centage of mantle length. 



2. Proportions of Arms, Web, and Tentacles: 



Arm formula, comparative lengths of arms expressed numerically, 

 3.4.2.1, in decreasing order. 



I, II, III, IV, length of dorsal, dorsolateral, ventrolateral and ventral 

 arms, measured on the right side, as a percentage of the mantle 

 length when used in the tables. In decapods, arm length is measured 

 from first basal sucker to tip of arm, in octopods from the mouth 

 to the tip of the arm. When used in the text, the numbers refer 

 only to the particular arm. 



ALI, arm length index: in octopods, length of longest arm as a percent- 

 age of total length. 



MAI, mantle arm index: in octopods, mantle length as a percentage of 

 length of longest arm. 



AWI, arm width index: in octopods, width of stoutest arm as a per- 

 centage of mantle length. 



WDI, web depth index: in octopods, depth of deepest sector as a per- 

 centage of length of longest arm. 

 635805—62 2 



